Facing for a jacket-crown.



I. BROWN. FACING FOR A JACKET CROWN- APPLICATION FILED APR-1h 1917- 1,232,203. Patented July 3,1917

ATTORNEYS WIT/(E8858 WW g UNITED ,s Arns PATENT onnion.

ISAAC s own, or nnw YonK, N. Y.

" nAoIiie Fort A JAcKn'ronowN.

"inthe county of Bronx and State of New York, have invented a new and Improved Facing for a Jacket-Crown, of which the following is a full, clear, and exact description.

My invention relates to a jacket crown, and has reference more particularly to a porcelain facing for same.

An object of the invention is to provide a jacket crown having a metallic socket and a porcelain facing.

Another object of the invention is to provide a facing to which the metal jacket can be easily and quickly secured by any one versed in the technique of dentistry.

A still further object of the invention is to provide a facing for the jacket crown which will be strong, so as not to crack easily, and which has means for engaging the metal which is to form the socket so that the same is firmly anchored into the body of the facing.

I attain the above and other objects of my invention by the structure conventionally disclosed in the accompanying drawings, wherein similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a vertical section on line 11, Fig. 2, of a facing for a jacket crown embodying my invention;

Fig. 2 is a rear elevation of the facing;

Fig. 3 is a transverse section on line 3 3, Fig. l; and

Fig. 4 is a longitudinal section through a crown jacket which has my facing and the metallic socket anchored thereto.

Referring to the drawings, the facing or tooth body 5 is provided with a recess 6 U shape in cross section (see Fig. 8) and rounded at the lower end, as shown at 7, (see Fig. 1). A T-shaped pin is anchored by its stem in the rounded end 7 of the recess so that the shoulders project above the rounded end of the recess and slant rearwardly away from the bottom of the recess. The body has also depressions 9 in the recess 6 leading toward the sides of the facing; there are two near the upper end of the recess and two near the lower end, the depressions being in proximity to the side walls of the recess to increase the "Specification of Letters Patent.

rammed Juiys, 191v.

Application filed April 17,1917. Serial in. 162,612.

binding of-the socket to be molded at the sides of the facing.

The socket 10 of the jacket crown is formed of metal which is cast in a suitable mold to thedesiredshap p ndin on the tooth to be fitted. The mold is so related to the facing that the metal forming the socket covers the surface of the recess 6, entering the depressions where it anchors; it also embeds the projecting portion of the T-shaped pin 8. The rounded end of the recess 6 of the facing relieves considerably the strain on the jacket during mastication; and the strain tending to separate the facing from the metal socket is relieved by the T-shaped pin 8 as well as by the metal engaged in the depressions 9. In addition, the sides of the recess 6 which grip the metal reduces any tendency of the socket to separate from the facing.

By providing a facing of porcelain with a metal socket, it is easier to match the por celain to the denture than in cases of whole porcelain jacket .crowns. It is, further, easier to adjust, as the socket is cast to the facing in accordance with the mold made from the impression. After selecting a facing having the desired color it is placed against the front of the tooth which it is to fit. The jacket is formed on the facing about the tooth it is to fit by means of wax. The facing with the wax jacket thereon is placed into a mold which is filled with plaster of Paris, or equivalent; the wax part is then boiled out and replaced by a metal which will, therefore, be anchored to the facing in a manner as previously described. In cases of whole porcelain crowns, great skill is required for properly adjusting the socket of the whole porcelain crown to the tooth it is to fit; in addition, it is harder to match, and the crown itself is more delicate, being fragile, due 'to the nature'of the material.

I claim:

' 1. A jacket crown comprising a porcelain facing and a metal socket anchored thereto, said socket being disposed longitudinally at the face and adapted to fit a tooth.

2. In a jacket crown, a porcelain facing having a recess in the rear thereof open at the top and closed at the bottom, said recess being U-shaped in cross section and adapted to receive a metal socket, and means embedded in the facing and'projecting into the recess and adapted to be embedded into the metal socket.

3. In a jacket croWn, a porcelain facing having a recess in the rear thereof open at the upper end and closed at the lower end Which is rounded, said recess being U-shaped in cross section and adapted to form a seat for a socket to be cast thereinto, said recess having means for anchoring the metal to be cast, and a pin projecting from the rounded endv of the recess adapted to be embedded in the socket to be cast into the recess.

4. In a jacket crown, a porcelain facing having a recess in the rear thereof open at the upper end and closed at the lower end Which is rounded, said recess being U shape in cross section and adapted to form a seat for a metal socket to be cast thereinto, said recess having depressions near the upper and lower ends thereof in proximity of the sides of the recess, and a T-shaped pin embedded With the stem in the rounded part of the recess and adapted to be embedded in the socket to be cast into the recess.

ISAAC BROWN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

